• Title/Summary/Keyword: phoswich 검출기

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Chest Wall Thickness Measurement of the LLNL Phantom for Ce Detectors (Ce 검출기를위한 LLNL 팬텀의가슴벽두께측정)

  • Lee, Tae-Young;Lee, Jong-Il;Chang, Si-Young
    • Journal of Radiation Protection and Research
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    • v.25 no.1
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    • pp.3-9
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    • 2000

  • The Korea Atomic Energy Research Institute acquired the Lawrence Livermore National Laboratory phantom for calibration of germanium detectors used for in vivo measurement of radionuclides deposited in human lungs. The manufacturer inscribed concentric circles as a phoswich detector positioning guides on the phantom's torso plate and its overlay plates, and provided the effective thickness of the chest wall for each plate measured at locations over the circles. However, since the germanium detectors are of different sizes, the areas considered for phoswich detectors were no. longer applicable for the locations of the germanium detectors on the phantom. Therefore, we re-evaluated the effective thickness of the phantom to determine if the manufacturer' s data are valid for germanium detectors in use for in vivo lung counting or if new values must be implemented. Differences no more than 3% in effective thickness were found between the germanium detector regions to be used at the Korea Atomic Energy Research Institute and the phoswich detector regions prescribed by the manufacturer.

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Development of the ZnS(Ag)/BC-408 phoswich detector for monitoring radioactive contamination inside pipes (배관 내부 방사능 오염도 측정용 ZnS(Ag)/BC-408 phoswich 검출기 개발)

  • Kim, Gye-Hong;Park, Chan-Hee;Jung, Chong-Hun;Lee, Kune-Woo;Seo, Bum-Kyoung
    • Journal of Radiation Protection and Research
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    • v.31 no.3
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    • pp.123-128
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    • 2006

  • A small radiation detection system is necessary for the direct characterization of alpha/beta-ray contamination inside pipes generated during the decommission of a nuclear facility. In this work, the new type phoswich detector consisting of the ZnS(Ag) and plastic scintillator for ${\alpha}/{\beta}$ simultaneous counting was designed as part of a development of a equipment capable of monitoring radiological contamination inside pipes. The optimum counting conditions in dimensions of scintillator and a detection system were experimentally confirmed and a performance of alpha/beta-ray discrimination was evaluated. As a result, optimum conditions of a detector suitable for monitoring radiological contamination inside pipes and a feasibility of application to pipe-inside were confirmed.

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Phoswich Detector for Simultaneous Measuring Alpha/beta Particles (알파/베타선 동시측정용 phoswich 검출기)

  • Kim, Gye-Hong;Park, Chan-Hee;Lee, Kune-Woo;Jung, Chong-Hun;Seo, Bum-Kyoung
    • Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT)
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    • v.6 no.2
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    • pp.111-117
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    • 2008

  • The new type phoswich detector consisting of the ZnS(Ag) and plastic scintillator for alpha/beta-ray simultaneous counting was developed for monitoring radiological contamination inside pipes. The detection performance was estimated using the PSD (pulse shape discrimination) method as a function of distance between the scintillator and radioactive source. The attenuation of particles traveling through a thin film for preventing the detector from being contaminated was experimentally estimated. It is concluded from our investigation that the phoswich detector developed can provide a sufficient alpha/beta-ray discrimination. The application of a thin film for preventing the detector from being contaminated was proven to be feasible.

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A Study of the Inorganic Scintillator Properties for a Phoswich Detector (Phoswich 검출기 제작을 위한 무기 섬광체 특성 연구)

  • Lee, Woo-Gyo;Kim, Yong-Kyun;Kim, Jong-Kyung;Tarasov, V.;Zelenskaya, O.
    • Journal of Radiation Protection and Research
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    • v.29 no.4
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    • pp.251-256
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    • 2004

  • CsI(Tl), $CdWO_4(CWO),\;Bi_4Ge_3O_{12}(BGO)\;and\;Gd_2SiO_5:Ce(GSO)$ scintillators were studied to manufacture a phoswich detector. The maximum wavelengths of the CsI(Tl), CWO, BGO and GSO scintillators are 550 nm, 475 nm, 490 nm and 440 nm for the radioluminescence, and the absolute light outputs of the CsI(Tl), CWO, BGO and GSO scintillators are 54890 phonon/MeV, 17762 phonon/MeV, 8322 phonon/MeV and 8932 phonon/MeV with a neutral filter, and the decay time of the CsI(Tl), CWO, BGO and GSO scintillators is $1.3{\mu}s,\;8.17{\mu}s$, 213 ns and 37 ns by a single photon method. The phoswich detector which was manufactured with plastic and CsI(Tl) scintillators could separate the ${\beta}$ particle and ${\gamma}$ ray. The phoswich detector could also measure the pulse height spectra of the ${\beta}$ particle and ${\gamma}$ ray by a PSD method.

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